<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>最大值</title>
</head>

<body>
  <?php
    $arr=array('10','12','9','7','20');
	$max=max($arr);
	echo '$arr数组中最大值是:'.$max;
  ?>
</body>
</html>